TECHNICAL PAPERS: Internal Combustion Engines: Cold start phenomena

Analysis of the Piston Ring/Liner Oil Film Development During Warm-Up for an SI-Engine

[+] Author and Article Information
K. Froelund, J. Schramm

Department of Energy Engineering, The Technical University of Denmark, Lyngby, Denmark

T. Tian, V. Wong, S. Hochgreb

Sloan Automotive Laboratory, Massachusetts Institute of Technology, Cambridge, MA

J. Eng. Gas Turbines Power 123(1), 109-116 (Oct 20, 2000) (8 pages) doi:10.1115/1.1341206 History: Received April 23, 1997; Revised October 20, 2000
Copyright © 2001 by ASME
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Liner temperature as a function of liner relative position and time. The time steps are 0, 30, 60, 90, 120, 150, and 180 s.
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Ring face profiles with a 0.10 μm RMS Gaussian roughness
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Low shear rate viscosity of the three lubricants
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Calculated average shear rate (γ̅̇) and critical shear rate (β) for the three rings for cold (20°C) and warm (100°) conditions, respectively
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High shear rate viscosity of the three lubricants
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High shear kinematic viscosity for the ring/liner interface during warm-up
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Simulation results for the SAE 10W30 oil  
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Average friction mean effective pressure for the ring-pack during the warm-up
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Cycle averaged ring-pack friction mean effective pressure during the warm-up




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